Which document maintains signature accountability in the field?

DA Form 5515, known as the "Signature Record and Maintenance," is specifically designed to maintain signature accountability in the field. This document is essential for tracking who has received items, as it requires the signature of the individual accepting responsibility for the items being issued. By capturing these signatures, the DA Form 5515 ensures that accountability is clearly established, which is critical for supply chain integrity and asset management in military operations.

The other forms mentioned serve different purposes. For instance, DA Form 3151 is used for the issue of property, but it does not specifically focus on maintaining signature accountability like DA Form 5515 does. Similarly, DA Form 5811 is primarily concerned with ammunition expenditure and does not address signature tracking directly. DA Form 5131-R is related to storage and inventory management rather than individual accountability through signatures. Thus, the function and design of DA Form 5515 make it the correct choice for this question.